The JACK Audio Connection Kit (JACK) is a soundserver or daemon that provides low latency connections between so-called jackified applications. It is created by Paul Davis and others and licensed under the GPL. JACK is free audio software. It can use ALSA, PortAudio and (still experimental) OSS as its back-end. As of 2003 it runs on GNU / Linux and Mac OS X.

JADE is an object-oriented programming language that exhibits a seamlessly integrated object-oriented database management system. It is designed to be an end-to-end development environment, which allows systems to be coded in one language from the database server at one end down to the clients at the other.

The Jakarta Project creates and maintains open source software for the Java platform. It operates as an umbrella project under the auspices of the Apache Software Foundation, and all of Jakarta products are released under the Apache License.

Java, in computer programming, is an object-oriented programming language developed by Sun Microsystems. It resembles C++, but was designed to avoid some of C++'s most notorious flaws. The Java language is used extensively on the World Wide Web, particularly because of its cross-platform nature, and its sandbox security concept.

Java bean, in computer programming, is a portable, platform-independent means of creating reusable components. Created by Sun Microsystems, Java Beans is intended to be similar in functionality to OpenDOC, ActiveX, OLE, and COM.

Java bytecode is the form of instructions that the Java virtual machine executes. Each bytecode instruction is one byte in length (hence the name), thus the number of bytecodes is limited to no more than 256. Not all 256 possible bytecode values are used, in fact Sun Microsystems, the original creators of the Java programming language, the Java virtual machine and other components of the Java Runtime Environment, have set aside a number of values to be permanently unimplemented. A Java programmer does not need to be aware of or understand Java bytecode at all. However, Understanding bytecode and what bytecode is likely to be generated by a Java compiler helps the Java programmer in the same way that knowledge of assembler helps the C or C++ programmer.

Java Platform, Enterprise Editor(Java EE), formerly known as Java 2 Platform, Enterprise Edition (J2EE), is a programming platform—part of the Java Platform—for developing and running distributed multitier architecture Java applications, based largely on modular software components running on an application server. The Java EE platform is defined by a specification. Similar to other Java Community Process specifications, Java EE is also considered informally to be a standard because providers must agree to certain conformance requirements in order to declare their products as Java EE compliant; albeit with no ISO or ECMA standard.

Java programming language, simply called Java in most cases, is an object-oriented programming language developed by James Gosling at Sun Microsystems 1995. Java borrows much syntax from C and C++ but has a simpler object model and fewer low-level facilities. Unlike conventional languages which are generally designed to be compiled to native code, Java is compiled to a bytecode which is then run (generally using JIT compilation) by a Java virtual machine. Java has been adopted as a multipurpose, cross-platform lingua franca for network computing, including the World Wide Web.

Java Compiler Compiler(JavaCC) is a parser generator for the Java programming language. JavaCC generates a parser for a grammar provided in extended Backus–Naur form (EBNF) notation with the output as the Java source code.

Javadoc is a computer software tool from Sun Microsystems for generating API documentation into HTML format from Java source code. Javadoc is the industry standard for documenting Java classes. Most integrated development environments (IDEs) will automatically generate Javadoc HTML.